Three days, one 300,000-pound bridge, two buildings, and mere inches to spare - there is no room for error on this next-to-impossible fix, as Riley helps lift a bridge between two buildings. Working in downtown Salt Lake City - with a commuter train running through the worksite, power lines all around, and five stories of parking garages below - two massive cranes will work in tandem, and all work has to be done in the dead of night.